I was half-wrong. E.Exit does activate again if Goli heals itself, but it will not activate again if Goli is healed by Z-Parting, Heal Pulse, Wish, etc.
Do you have proof of this? I assumed the ability would re-activate if Golisopod were to be healed by any means. Post #69 actually states that Z-Parting does work with Emergency Exit. I also don't see it mentioned anywhere, but if Golisopod is hurt below 50% because of Poison or Burn effects the ability won't trigger, at least not in showdown.
Aside from that, I agree with the opinion that Golisopod will end up being UU with niche uses for OU. Having playing mostly Pre-bank OU, Golisopod doesn't have much to do with Celesteela, Toxapex and Tapu Lele running around in every other team. Goli is also fairly easy to set-up onto (Mega-Scizor or Mega-Pinsir Swords Dance) , and with the Psychic Terrain its role as powerful, priority-based revenge killer is denied in most cases. It can have some uses if you're good at predicting switches and making them eat a Liquidation to the face as mentioned by others, but if that Scizor gets one or two swords dances for free you're screwed.
With that said, Pre-bank OU he can have some good uses with Assault Vest. With it he can actually survive Modest Scarf Tapu-Lele's entire moveset and force her out with Liquidation (surviving above 50% of course), but at the cost of losing a lot of ATK. Goli also needs support to get rid of SR if it wants to fulfill his "free switch-in" role for its teammates.
Overall I'm having mixed feelings about Golisopod. While its ability is cool and can be very useful, a lot of potential miss-plays can happen because of it, and the fact that it can't wall-break a lot of the OU mons takes much of the appeal away. Still, a cool mon regardless that I hope can do well on lower tiers.
By the way, has anyone tried him as an anti-lead? I feel like it can do very well against the current, most-popular leads in the Pre-Bank meta (I haven't played much pokebank yet) . It can do a good job against Nihilego, Lycanrock-Midday and Mamoswine, OHKO'ing all of them with Liquidation and can then break the Sash with Aqua Jet. If they choose to attack rather than SR, none of them can put him below 50%. However, Necrozma, Pelipper and Gigalith can be a problem with this idea:
Golisopod (Golisopod) @ Assault Vest
Ability: Emergency Exit
EVs: 216 HP / 132 Atk / 160 SpD
Adamant Nature
- Leech Life / Sucker Punch
- Aqua Jet
- First Impression
- Liquidation
Evs are split on SPD to take Tapu Lele's hits so that the scarfed version can't put him below 50% even if it's Modest provided there are no hazards. Other than that, not much to say, it's the standard set with EV spreads so he can tank more hits on the special side at the cost of attack power. I'm not entirely convinced about the viability of this set, especially with the already mentioned walls that are Skarmory, Celesteela, Toxapex, etc, but I feel like Assault Vest is the way to go with this Mon.
You could also run a very gimmicky set with Swords Dance to surprise people trying to switch-in their Scizor / Pinsir / Celesteela then hit them really hard, but you'd have to get rid of the assault vest and his speed is nowhere near enough to hit those mons with something that isn't aqua jet. Celesteela with no EVs on Sp.ATK has a good chance of popping Emergency Exit, and Mega-Pinsir will Ohko you with Return. Emergency Exit also makes this set very hard to execute.
All in all, I feel like he's just outclassed by the OU meta, and hope that he can find some uses in the lower tiers. A bit of a shame for one, in my opinion, the best designs in this generation.